RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-418-102559 with event index number of 191436

Geocentric closest approach at 2019/05/09 13:30:41 UTC

J2000 position of star is 18:49:07.5 -06:29:39
Equinox of date position of star is 18:50:04.2 -06:28:23
Stellar brightness R=14.8, use SENSEUP=128
Star is 164 degrees from the moon. Moon is 23% illuminated.
TNO apparent brightness V=20.5

TNO is 46.6 AU from the Sun and 46.0 AU from the Earth.
The TNO is moving 14.7 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 661 seconds.
The 1-sigma cross-track error in the shadow position is 2775 km.

The TNO has an absolute magnitude Hv=3.7
Diameter=1096.5 km assuming a 5% albedo -- 74.3 sec chord
Diameter=447.7 km assuming a 30% albedo -- 30.4 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 307261, (2019/05/09 13:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.8 -26:28:24  0.9 38.76 143
60Bet Oph      17:44:25.8 +04:33:38  2.8 19.77 146
PPM 202138     18:48:30.9 -05:40:58  4.6  0.89 163
PPM 202129     18:47:49.0 -06:40:05  8.1  0.62 164
PPM 202152     18:49:36.0 -06:26:31  9.0  0.14 163
307261         18:50:09.9 -06:28:16 14.8       164
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 307261, (2019/05/09 13:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 38.76 143
60Bet Oph      17:43:28.3 +04:34:05  2.8 19.77 146
PPM 202138     18:47:28.9 -05:42:19  4.6  0.89 163
PPM 202129     18:46:46.5 -06:41:25  8.1  0.62 164
PPM 202152     18:48:33.6 -06:27:54  9.0  0.14 163
307261         18:49:07.5 -06:29:39 14.8       164
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:05:53 UT

Marc W. Buie, Southwest Research Institute

RECON